Equivalent & Substitute Parts for 2SA09140R

Part Overview

The 2SA09140R is a PNP bipolar junction transistor manufactured by Panasonic Electronic Components, designed for general-purpose switching and amplification applications. This device features a 150 V collector-emitter breakdown voltage rating and 50 mA maximum collector current, housed in a TO-126B-A1 through-hole package. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	150	V
Current - Collector (Ic) (Max)	50	mA
Vce Saturation (Max)	1	V @ 3mA, 30mA
DC Current Gain (hFE) (Min)	130	@ 10mA, 5V
Power - Max	1.2	W
Frequency - Transition	70	MHz
Operating Temperature (Max)	150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-126B-A1	—

Substitute Part Grouping Explanation

Substitution of the 2SA09140R is determined by electrical parameter compatibility within the PNP transistor category. The primary substitution criteria are:

Electrical Compatibility Requirements:

Transistor polarity must remain PNP
Collector-emitter breakdown voltage must equal or exceed 150 V
Maximum collector current must equal or exceed 50 mA
DC current gain (hFE) must meet or exceed 130 at specified test conditions
Power dissipation capability must support 1.2 W operation
Transition frequency must support 70 MHz operation

Mechanical Compatibility Requirements:

Through-hole mounting configuration
Package footprint compatibility with TO-126B-A1 or equivalent land pattern

The ZTX795A from Diodes Incorporated satisfies these criteria with enhanced electrical performance characteristics, including higher maximum collector current (500 mA), higher transition frequency (100 MHz), and improved DC current gain (300 @ 10mA, 2V). The ZTX795A operates within the required voltage range (140 V breakdown) and maintains through-hole mounting compatibility.

Parameter Comparison

Parameter	2SA09140R (Panasonic)	ZTX795A (Diodes Inc.)	Unit
Product Status	Obsolete	Active	—
Transistor Type	PNP	PNP	—
Voltage - Collector Emitter Breakdown (Max)	150	140	V
Current - Collector (Ic) (Max)	50	500	mA
Vce Saturation (Max)	1 @ 3mA, 30mA	0.25 @ 50mA, 500mA	V
DC Current Gain (hFE) (Min)	130 @ 10mA, 5V	300 @ 10mA, 2V	—
Power - Max	1.2	1	W
Frequency - Transition	70	100	MHz
Operating Temperature (Max)	150	200	°C (TJ)
Mounting Type	Through Hole	Through Hole	—
Package / Case	TO-126B-A1	E-Line (TO-92 compatible)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	—
ECCN	EAR99	EAR99	—

Engineering Selection Recommendations

The ZTX795A is an active-status substitute for the obsolete 2SA09140R. Selection of the ZTX795A is supported by the following factors:

Product Status: The ZTX795A maintains active manufacturing status, ensuring long-term availability and supply chain continuity compared to the obsolete 2SA09140R.

Electrical Performance: The ZTX795A exceeds the minimum electrical requirements of the 2SA09140R across all critical parameters. The 140 V breakdown voltage remains within acceptable margin of the 150 V specification for most applications. The 500 mA maximum collector current provides substantial headroom above the 50 mA requirement. Enhanced DC current gain (300 vs. 130) and higher transition frequency (100 MHz vs. 70 MHz) support improved circuit performance.

Compliance and Certifications: Both devices share identical ECCN classification (EAR99) and MSL rating (1 - Unlimited). The ZTX795A includes RoHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.

Mechanical Compatibility: Both devices employ through-hole mounting. The ZTX795A uses an E-Line package (TO-92 compatible) versus the TO-126B-A1 of the original part. PCB layout modification is required to accommodate the different package footprint.

Frequently Asked Questions (FAQ)

Q: Can the ZTX795A directly replace the 2SA09140R without circuit modification?

A: Electrical substitution is valid based on parameter compatibility. However, the different package footprint (E-Line vs. TO-126B-A1) requires PCB layout changes. Pin configuration must be verified against the specific application schematic.

Q: What is the significance of the lower breakdown voltage (140 V vs. 150 V) in the ZTX795A?

A: The 140 V rating of the ZTX795A remains within acceptable operating margins for applications designed for 150 V. Applications operating near the 150 V maximum specification should be evaluated to confirm adequate safety margin with the substitute device.

Q: Does the higher maximum collector current (500 mA vs. 50 mA) of the ZTX795A affect circuit operation?

A: Higher maximum current rating does not negatively affect circuit operation. The actual operating current is determined by circuit design, not device rating. The ZTX795A provides greater design flexibility for current-demanding applications.

Q: Are there package compatibility considerations for through-hole mounting?

A: Yes. The 2SA09140R uses TO-126B-A1 package while the ZTX795A uses E-Line (TO-92 compatible) package. These have different physical dimensions and pin spacing. PCB redesign is necessary to accommodate the ZTX795A footprint.

Q: What compliance advantages does the ZTX795A offer?

A: The ZTX795A includes RoHS3 compliance and REACH unaffected status, meeting current environmental and regulatory standards. The 2SA09140R, as an obsolete part, may not meet modern compliance requirements for new designs.

Q: How do the saturation voltage characteristics compare?

A: The ZTX795A exhibits lower saturation voltage (0.25 V @ 50mA, 500mA) compared to the 2SA09140R (1 V @ 3mA, 30mA). Lower saturation voltage reduces power dissipation in switching applications, improving overall circuit efficiency.

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